I traded a Roxio game capture on Craigslist for a mid 2007 Mac Mini. It has the normal specs of that model, but it also has a partition on it for windows 7. The guy gave me the device, the power and VGA cords, and a desk that i think is a restore disk for the Lion operating system. Everything works fine except it wont let me access the admin accounts. I entered the stuff he told for the name and password but it says its wrong, so the only account i can access is the standard account. Is their a way I can reset the admin accounts or something? If I use the restore disk he gave me, will it reset all of the accounts and make it how it was when it was originally purchased a few years ago?